﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Threading;

namespace Xceed.Silverlight.DataGrid.Export
{
  internal class ExporterAsyncResult : IAsyncResult
  {
    internal ExporterAsyncResult( AsyncCallback asyncCallback, object asyncState )
    {
      if( asyncCallback == null )
        throw new ArgumentNullException( "asyncCallback" );

      this.AsyncCallback = asyncCallback;
      this.AsyncState = asyncState;
      this.CompletedSynchronously = true;
    }

    #region AsyncCallback Property

    internal AsyncCallback AsyncCallback
    {
      get;
      private set;
    }

    #endregion

    #region IAsyncResult Members

    public object AsyncState
    {
      get;
      private set;
    }

    public System.Threading.WaitHandle AsyncWaitHandle
    {
      get
      {
        if( m_waitHandle == null )
        {
          m_waitHandle = new ManualResetEvent( false );
        }

        return m_waitHandle;
      }
    }

    public bool CompletedSynchronously
    {
      get;
      internal set;
    }

    public bool IsCompleted
    {
      get
      {
        return m_isCompleted;
      }
      internal set
      {
        if( value != m_isCompleted )
        {
          m_isCompleted = value;

          if( value && ( m_waitHandle != null ) )
          {
            m_waitHandle.Set();
          }
        }
      }
    }

    #endregion

    private ManualResetEvent m_waitHandle;//null
    private bool m_isCompleted;//false
  }
}
